[Audacity-quality] Documentation FAQ: Error code -9997 / -9999

[Steve t. F. <ste...@gm...>]

Should we list error codes in the FAQ?
Error code -9997 seems pretty common. (can't open recording device, invalid
sample rate).

The old error message:
"Error opening sound device" has been changed, so it is now either:

"Error opening Recording device"
or
"Error opening Playback device"

In each case, there is also an error code and description (from PortAudio).
The most common error codes appear to be:
-9997 Invalid sample rate.
-9999 Unanticipated host error

The latter (9999) means "something is wrong". And appears to most often be
due to either:
* a lost connection to a USB audio device.
* Recent Windows / Mac update requiring that user gives permission for
Audacity to access the microphone.

Steve